Fix re.split DeprecationWarning

[jamesjer]

Silences this DeprecationWarning with python 3.13.0b2:

  /builddir/build/BUILD/python-jupytext-1.16.2-build/BUILDROOT/usr/lib/python3.13/site-packages/jupytext/cell_metadata.py:260: DeprecationWarning: 'maxsplit' is passed as positional argument
    options = re.split(r"\s|,", options, 1)

[github-actions]

Thank you for making this pull request.

Did you know? You can try it on Binder: or .

Also, the version of Jupytext developed in this PR can be installed with pip:

HATCH_BUILD_HOOKS_ENABLE=true pip install git+https://github.com/jamesjer/jupytext.git@main

(this requires nodejs, see more at Developing Jupytext)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.73%. Comparing base (42a48e8) to head (89c450e).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1241   +/-   ##
=======================================
  Coverage   97.73%   97.73%           
=======================================
  Files          29       29           
  Lines        4468     4468           
=======================================
  Hits         4367     4367           
  Misses        101      101           

Flag	Coverage Δ
external	75.14% <100.00%> (+0.09%)	⬆️
functional	88.52% <100.00%> (ø)
integration	77.28% <100.00%> (ø)
unit	66.56% <100.00%> (ø)

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[mwouts]

Thank you @jamesjer for the fix!